Segment 4 indicates a pressure range of:

The correct choice reflects the specific pressure range indicated in Segment 4 of the MSA G1 SCBA system. A pressure range of 0 to 35% signifies that the device is designed to operate effectively within this range, which is crucial for ensuring that the breathing apparatus functions properly. This range is typically set to alert the user about the available air supply in the tank and to ensure that the wearer remains within safe operational limits.

Understanding the pressure range is essential for the effective use of the SCBA, as it directly impacts the safety and effectiveness of the apparatus in hazardous environments. The 0 to 35% range is indicative of the threshold at which the system may give warnings or require action, ensuring the user can manage their oxygen supply effectively during operation.